closes #2332.  raises event when repopulating textbox
Merge pull request #2333 from Stanford-Online/jbau-graded-exam-repop-event

closes #2332.  raises event when repopulating textbox
Fix for issue #1931: looping video on thumbnail click

Fix for issue #1931: looping video on thumbnail click - a timing issue
- the pause plus moving the play into the handle event seems to fix
this. Not sure that the selectSlide in the onclick is necessary either
as it is called in the handle event but didn't want to change that